Hi Michael,
As Ben said, some sort of Narrowband filter will help bring out any nebulae in a suburban setting more than the CLS will. Although a decent one may set you back a few hundred dollars, they should last a long time and will make a big difference to your viewing experience - I'd be getting one of these first. The GSO Superviews are remarkably good eyepieces for the price - you could consider the 30mm version as well, although if your budget stretched you could look into an Explore Scientific 82° 30mm (for 3-4x the price of a GSO!). Maybe a 2x Barlow to double the effective magnification of your current eyepiece collection. There's no right answer, and as long as you have the funds, you can fill in the gaps in your collection of gear whenever you feel the need, but I think a narrowband filter would be a good starting point.
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